html{
    background-color: #f1f1f4;
    padding-top: 44px;
    padding-bottom: 54px;
}
header{
    background-color: #1c6dc0;
    color: #ffffff;
    padding: 10px;
    font-size: 18px;
    /* 固定定位 */
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
}
footer{
    display: flex;
    text-align: center;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: #000;
}
footer a{
    width: 20%;
    color: white;
    text-decoration: none;
    font-size: 12px;
    padding-top:5px;
    padding-bottom: 10px;
}
footer a.active{
    color: #ff0000;
}
footer img{
    height: 20px;
}